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Como escanear um código QR a partir de uma captura de ecrã
Um código QR é um quadrado legível por máquina que pode abrir um URL, ligar ao WiFi, guardar um contacto ou iniciar outra ação. Este guia mostra como lê-lo numa imagem guardada sem apontar um segundo telemóvel ao ecrã.
É possível escanear um código QR de uma captura de ecrã?
A leitura de uma captura extrai dados QR de uma imagem fixa guardada, ao contrário da leitura pela câmara em direto.
What You'll Need
Como escanear um QR de uma captura de ecrã
In 2026, we tested screenshot scanning on iPhone with Photos and Live Text and on Android with Google Photos and Google Lens, using QR codes shared through WhatsApp, email attachments, and saved downloads. Our success signal was a visible destination preview; results can vary by device and app version.
- 1
Localize a imagem
Abra Fotos, Galeria, Google Fotos, Ficheiros ou a aplicação de mensagens onde está a imagem QR.
- 2
Abra em ecrã inteiro
Mantenha o QR completo e a margem branca visíveis; recorte ou compressão podem impedir a leitura.
- 3
Use a deteção integrada
No iPhone use o banner de ligação ou Texto em direto. No Android toque em Google Lens ou Pesquisar imagem.
- 4
Reveja o destino
Leia a pré-visualização do URL ou da ação antes de continuar.
- 5
Abra a ação
Siga a indicação apresentada pelo dispositivo.
Screenshot Scanning Methods Compared
Methodology note: native tools were tested with QR images from chat apps, email attachments, and downloads. Detection may work offline on some devices, but opening a web destination still requires internet access.
| Method | Best for | Extra app | Saved images | Offline scan |
|---|---|---|---|---|
| iPhone Photos / Live Text | Screenshots, saved photos, iMessage images | No | Yes | Partial |
| Android Google Photos + Lens | Downloads, WhatsApp images, screenshots | Usually no | Yes | Partial |
| Google Lens app | Cross-platform image scanning | Google app | Yes | Partial |
| Third-party scanner app | Older devices without native detection | Yes | Varies | Varies |
| Live camera scan | Printed codes or another device's display | No | Not applicable | Partial |
How to Scan a Screenshot on iPhone
- 1. Open the screenshot in the iPhone Photos app.
- 2. Keep the QR code and its white border fully visible.
- 3. Tap the detected link banner, Live Text icon, or QR area.
- 4. Review the URL preview, then tap to open it.
How to Scan a Screenshot on Android
- 1. Open the image in Google Photos or your Gallery app.
- 2. Tap Google Lens or Search image when available.
- 3. Wait for Lens to identify the QR code and show its action.
- 4. Review the destination, then tap to continue.
How to Scan a QR Code From Common Sources
WhatsApp, iMessage, and SMS
Save the original image to your camera roll or screenshot the chat, then open it in Photos or Gallery. Prefer the full-resolution image over a forwarded thumbnail when you can.
Email and Gmail attachments
Download the image attachment, open it in Photos or Google Photos, and run image detection. For a PDF, screenshot the QR region or export the page as an image if direct detection is unavailable.
Slack, Teams, and work chat apps
Save the shared image to your camera roll first. Opening it with your native photo app gives Live Text or Lens a clearer image than a compressed in-chat preview.
Browser downloads and PDFs
Open a downloaded image full screen. If the QR code is embedded in a PDF or web page, take a clean screenshot of the entire code and scan that saved image.
A QR code on your own screen
You do not need another phone. Screenshot the code, open the saved image in Photos or Gallery, and use image-based detection; live Camera mode is designed for external targets.
How to Screenshot a QR Code for Later Scanning
Screenshotting is useful when a connection is slow, when you need to share a code, or when you want to archive an event ticket or WiFi credential. Capture a clear, uncropped image now and use your photo app's detection tool later.
- Include the complete QR code and its quiet zone in the capture.
- Use a native screenshot or high-quality PNG when possible.
- If photographing a screen, reduce glare and moiré patterns first.
- Store important codes in Photos or a dedicated album so they are easy to find.
Which Screenshot Scanning Method Should You Use?
| Your situation | Recommended method |
|---|---|
| iPhone with iOS 15 or later | Open Photos and use Live Text or the detected link banner. |
| Android with Google Photos | Open the image and tap Google Lens or Search image. |
| Native detection fails | Try Google Lens, then compare trusted scanner apps. |
| QR is on your own screen | Screenshot it, then scan the saved image. |
| Printed code or packaging | Use a live camera scan and see the device-specific guides. |
| Campaign QR needs testing | Run a screenshot scan test before printing or publishing. |
Live Camera Scan vs Screenshot Scan
| Factor | Live camera scan | Screenshot scan |
|---|---|---|
| Speed | Fastest for physical codes | Fastest for digital-only codes |
| Best use case | Posters, packaging, menus | Chat images, tickets, screen shares |
| Second device needed | Sometimes | No |
| Image-quality risk | Lighting and camera blur | Compression and cropping |
| Dynamic QR analytics | Standard redirect flow | Generally the same redirect flow |
Use Cases for Scanning QR Codes From Screenshots
Event tickets and boarding passes
Open a QR code sent in a confirmation message without asking the organizer to resend it.
WiFi credentials
Read a WiFi QR code shared as an image and review the network prompt before joining.
Menus and coupons
Open a QR code downloaded from social media or email when the original post is no longer nearby.
Remote presentations
Capture a QR code shown in a screen share, then scan the saved image after the meeting.
PDF manuals
Extract a product registration or warranty QR code from a downloaded PDF page.
Campaign testing
Verify that your own QR code opens the right destination before you print or publish it.
Common Mistakes When Scanning Screenshots
Cropping the quiet zone
Recapture the complete code with its white border visible.
Using a blurry or compressed image
Save the original image or take a fresh native screenshot.
Using Camera on the same screen
Open the saved image and use Live Text or Lens instead.
Opening an unknown link immediately
Review the destination preview and verify the sender first.
Assuming every Android Gallery has Lens
Open the image in Google Photos if your Gallery app lacks image search.
Photographing a bright screen
Reduce glare and moiré, or request the original image file.
Best Practices for Screenshot QR Scanning
Keep the full code
Preserve every module and the quiet zone around the QR pattern.
Use clear source files
Prefer PNG, an original download, or a native screenshot over a compressed forward.
Check before opening
Confirm the URL, WiFi network, contact, or other action before tapping.
Keep software current
Update iOS, Android, Google Photos, or Lens for the latest detection support.
Test before publishing
Test both printed and screenshot workflows before a campaign launch.
Use editable destinations
Dynamic QR codes can keep a shared image useful even after a destination changes.
Does Screenshot Scanning Affect QR Analytics?
A dynamic QR code → redirect layer → editable URL → scan analytics → campaign ROI. A static QR code has a fixed destination and no redirect layer, while a dynamic QR code can be updated after sharing. QR-Build is a generator, not a scanner app; use screenshot scans as a practical test of codes you create or receive.
Dicas de segurança
- Verifique o remetente.
- Inspecione o URL apresentado.
- Tenha cuidado com pedidos de início de sessão ou pagamento.
- Visite o site oficial independentemente se o destino parecer suspeito.
Troubleshooting Screenshot QR Scanning
No detection prompt appears
Open the image in Google Photos, try Google Lens, and update your operating system or photo app.
The code looks damaged
Request the original image or capture a new screenshot with the full code visible.
The wrong destination opens
Do not continue; capture the code again and compare the preview with the expected domain.
A Gallery app has no Lens option
Share or open the image in Google Photos, or use a trusted image-scanning tool.
Glossary
Screenshot scan
Reading QR payload from a saved screen capture with image-based detection such as Live Text or Google Lens, distinct from live camera scanning.
Saved image scan
Detecting a QR code inside a photo, downloaded file, or attachment rather than through a camera viewfinder.
Live Text
An iOS feature that recognizes text, links, and actionable content in still images, including some QR codes.
Google Lens
Google's visual search tool, used in Google Photos and the Google app, that can read QR codes in images.
Quiet zone
The clear white border around a QR code that helps scanners separate its pattern from nearby content.
Dynamic QR code
A QR code with an editable redirect destination and scan analytics; its redirect can be changed without re-sharing the image.
QR-Build Features for Testing and Sharing QR Codes
If you create QR codes, a screenshot scan is a quick pre-launch test for the digital channels where customers actually receive images. QR-Build offers static QR codes and dynamic QR options with editable destinations and scan analytics; choose the option that suits your campaign and review plans before purchasing.
Related How-To Guides
Perguntas frequentes
Pode escanear um QR code de uma captura de ecrã?
Sim. Abra a captura em Fotos ou Galeria e use Texto em direto ou Google Lens; não é necessário outro dispositivo.
Funciona no iPhone?
Sim. Abra a imagem em Fotos e use o banner de ligação ou Texto em direto. Consulte o guia completo para iPhone.
Funciona no Android?
Sim. Abra-a no Google Fotos e toque em Google Lens. Consulte o guia completo para Android.
Crie o seu código QR
Crie um QR para partilhar e teste-o a partir de uma captura antes de publicar.
Criar código QR grátis